Telegraph communication system



June 18, 1935. D. B. PERRY Re- 19,614

TELEGRAPH COMMUNICATION SYSTEM Original Filed June 2l, 1950 5Sheets-Sheet 1 AT TORNEY June 18, 1935. D. B. PERRY TELEGRAPHCOMMUNICATION SYSTEM Original Filed June 21, 1930 5 Sheets-Sheet 2/NVENTOR D. B. PERRY ATTORNEY June 18, 1935. D. B. PERRY TELEGRAPHCOMMUNICATION SYSTEM Original Filed June 2l, 1930 3 Sheets-Sheet 5 ATTORNEV /NvE/v 70A 0. 8. PERRY 7 un bm wh 69mm M. M ma lll @lxlgm mh #vhNm. @l whim. "um .MQ maL. qu t b mw with any or all divisionheadquarters without broadcasting to the receiving stations associatedwith the respective division switchboards this may be done bytransmitting from general headquarters without operating code selectorkey 1.

In addition, receiving sets 9 are provided at the central switchboard Aand at the respective division switchboards for connection in eachtelegraph channel 8 associated with each division. In broadcasting fromcentral station A, each of the sets 9 located at A is actuated by theproper functioning of the apparatus at the respective division stationto which the set is connected by its respective telegraph channel 8. Inthis manner, headquarters is provided with a visual typewritten recordof the message being broadcast and automatically retransmitted back overthe telegraph channel B as an indication of the proper functioning ofthe apparatus at each oflice.

The detail operation of the system will now be explained in connectionwith Figs. 2 and 3.

Broadcasting from general heaquarters Fig. 2 taken together with Fig. 3and placed to the left of Fig. 3 shows a schematic circuit of thegeneral headquarters station equipment as well as that of the equipmentat a division station. In connection with these figures, the circuitoperation wil first be considered for broadcasting a message fromgeneral headquarters (Fig. 2) to one or more division stations (Fig. 3).Only two telegraph channels and two receiving stations are shownconnected to the central switchboard.

Assuming that the operator at general headquarters desires to broadcasta message through the division headquarters to the receiving stationsassociated with the divisions, code selector key 1 will be operated. Theoperation of code key 1 through one revolution will transmit a series ofspecial break and make signals by causing spring II of the key to makeand break contact with insulated bushings I and IDD thus opening andclosing the operating path for relay I2. Relay I2 is a special masterrelay with two windings and is normally held operated to its markingposition on a circuit from battery through the upper winding of relay I2to ground through the sending and receiving printer I3 and the contactof code key 1. Current through the lower or biasing winding tends tooperate relay I2 against its spacing contact. The strength of thecurrent flowing through the upper winding is greater than the biasingcurrent and holds the armature of relay I2 to its marking contact. 'Ihetransmission of an open or break signal from printer I3 or code key 1will open the operating circuit through the upper winding and cause thearmature of relay I2 to move to its spacing contact.

At this point, it will be noted that sending relays I4, I5, I6 and I1have their operating windings connected in series in a circuit havingone end connected to the spacing Contact and the other end connected tothe marking contact of the master relay I2, as shown. Resistances 4I!and 4I connect the marking and spacing contacts, respectively, of relayI2 to battery I8. The armature of relay I2 is grounded.

As the armature of relay I2 operates, in accordance with signalstransmitted from printer I 3 or from code selector key 1, it causes thespacing and marking contacts of relay I2 to be grounded alternately.W'ith the armature thereof on the spacing contact, current flows frombattery I8 through resistance 4D through the windings of all the sendingrelays in series and thence to ground through the spacing contact andarmature of relay I2. All the sending relays I4, I5, I6 and I1 are thenoperated against their respective spacing contacts. When the armature ofrelay I2 moves to its marking contact the direction of current flowthrough the windings of the sending relay is reversed, the currentflowing now through resistance 4I and through the windings of thesending relays in series to ground through the marking contact andarmature of relay I2. The sending relays are thus operated against theirrespective marking contacts. In this way, all the sending relays arecaused to operate simultaneously, and to follow the signals transmittedfrom printer I3. Any number of sending relays may be inserted in thecircuit, with their windings in series, to transmit signals to anydesired numbcr of division stations or branch receiving stations.

The operation of sending relay I4, in accordance with the signalstransmitted by relay I2, will open and close a circuit traced frompositive battery :33 through the winding of relay 20, contacts of relayI4, through one side of telegraph channel !8 to ground 41 through thereceiving printer 48 and one winding of relay 4B at the divisionheadquarters (Fig. 3), operating the receiving printer, causing thearmature of relay 46 to follow the operation of relay I4 and releasingrelay 2B. The operation of relay 4B (Fig. 3) will actuate relayequipment at the division switchboard connected to channel I8 and willcause signals to be automatically transmitted back. over thc line I3 tooperate receiving printer 26. This will be described in connection withFig. 3. As mentioned previously, full duplex, one-way, or other types ofrepeaters may be inserted into the telegraph channel, if considereddesirable.

Relay 20, in releasing, will light lamp 22 as an indication to theoperator at the switchboard that signals are being sent to the divisionstation connected to telegraph channel I8.

Key 24 is provided for short-circuiting the contacts of sending relay I4to prevent the signals from being transmitted over channel I8. In thismanner, the central switchboard may broadcast to a selected few of thedivision stations, or to all the divisions as desired.

It is to be noted that the operator at general headquarters, by watchingthe lamp indicators or the position of keys 24 and 25, can quicklyobserve which division stations are connected to receive the broadcastsignals. The operation of the receiving set 26 is a visual indication tothe central switchboard operator that the apparatus at the divisionstation to which the set is connected is functioning properly.

Receiving set 28 is also used to receive signals which are initiated atthe division switchboard. This will be described in connection with thetransmission of signals from a division station.

Telegraph channel II! connects another division switchboard to thecentral switchboard. Lamp indicator 23 and receiving set 21 associatedwith sending relay I and telegraph channel I9 are provided to functionin a manner similar to that described for lamp indicator 22 andreceiving set 26 associated with sending relay I4. Short-circuiting key25 and relay 2I are connected in the circuit in a manner similar to thatdescribed for short-circuiting key 24 and relay 2l) and serve a similarpurpose.

For operating the branch receiving sets 3| and 32, which are local tothe central switchboard, sending relays IS and I1 and keys 31 and 38 areprovided. One-way polar repeaters D and D' connect the centralswitchboard with the receiving sets through telegraph lines 33 and 34.The polar repeaters are well known in the telegraph art and theiroperation.- Will be described in connection with the transmission ofsignals to the receiving stations.

To condition repeater D for transmitting, key 31 is operated. This willremove short-circuiting ground 5II from the marking contact of relay I5and will permit the operation of relay I6, in accordance with theoperation of master relay I2, to correspondingly operate relay 35, on acircuit from ground on the armature and contact of relay I6 to batterythrough the left winding of relay I5. Relay 35 has two windings, throughone of which a biasing current flows. This biasing current normallytends to keepthe armature against the left contact. The flow of currentthrough the left winding operates relay 35 and causes its armature tomove to the right. The alternate movement ci the armature of relay 35Will transmit current rst of one polarity and then 'of the otherpolarity to operate receiving set 3l over telegraph line 33. Filter 39is a noise killer and serves to reduce undesirable interference in othertelegraph and telephone wires.

In a similar manner, receiving set 32 will receive the transmittedmessage through one-way polar repeater D' (identical with D) upon theoperation of key 38.

At this point, it will be noted that in cases where the receivingstation is not at a great distance from the switchboard the one-waypolar repeater may be eliminated. In such case and under certainconditions battery will be supplied at the contact of relay I6 insteadof ground, and key 81 will be inserted in series with the telegraph line33, with ground 30 removed from the circuit.

It will be noted that the operator at the central switchboard maytransmit to one or all divisions, and to one or all the receiving setsconnected to general headquarters by operating the proper keys. This isquite different from the operation of the division switchboard, whichwill now be described.

Receiving broadcasting signals at division headquarters Returning to thecondition previously described wherein sending relay I4 operated to itsmarking position, it will be recalled that the operation of relay I4operated relay 46 to its marking position and also operated receivingprinter 48 (Fig. 3). Normally the armature of relay 45 is held to itsmarking contact over a circuit traced from ground 41 (Fig. 3) throughthe right-'hand winding of relay 45, receiving printer 48, telegraphchannel I8, I8, marking contact of relay I4, winding of relay 2U, tobattery 43 (Fig. 2). It will be noted that a small amount of currentflows through the left or biasing winding of relay 46. This currenttends to move the armature of relay 45 toits spacing contact but is notof suiiicient strength to overcome the current through the right oroperating winding.

The operation of code key 1 will cause spring I I to touch insulatedbushing Ill, in turn. releasing relay I2 and sending relays I4, I5, I6and I1 to their respective spacing contacts, The release of relay I4 toits spacing contact, will open the operating path through the right-handwinding of relay 45 which, in turn, will move to its spacing contact.The movement of the armature or relay 46 to its spacing contact willcomplete a circuit to operate relay 49 on a path from ground on thearmature and spacing contact of relay 45 to battery through the windingof relay 49. At this point, it will be noted that relay 5I) is normallyoperated on a circuit from ground on the armature and break contact ofrelay 49 to battery through the winding of relay 5|). Therefore, theoperation of relay 49 will cause the release of relay 50. A circuit willnow be completed to operate counting relay 5I on a path from ground onthe armature of relay 49 through the contacts of relays 49, 59, 59 and52 to battery through the winding of relay 5I, operating relay 5I. Atthis time spring II of code key 1 will have left the insulated bushing Iand again made contact with the key to reoperate relay I2 and move thearmature of relay I2 to the marking contact. This will operate sendingrelay I4 (Fig. 2) to its marking contact, in turn operating relay 45 toits marking contact. The operation of relay 46 Vwill open the operatingpath for relay 49 which will release and cause the reoperation of relay55. At this time counting relay 52 will operate and lock up on a pathfrom battery through the windings of relays I and 52, in series, toground through the contacts of relays 5l and 59. When spring II of codekey 1 touches insulated bushing IDD to transmit another break signal, anopen circuit will again occur over channel I8 which will again releaserelay 4B to its spacing contact. As mentioned before relay 49 willoperate and relay 5U will release. A circuit will now be completed tooperate counting relay 53 from ground on the armature of relay 49through the contacts of relays 49, 59, 55, 52 and 54 to battery throughthe winding of relay 53 operating relay 53. Code key 1 will now returnto normal and spring II will again make contact with the key, thusactuating master relay I2 to its marking contact and causing a closureof the circuit over channel I3. This last closure will cause theoperation of relay 46 to its marking contact, the subsequent release ofrelay 49, and the reoperation of relay 5D. Counting relay 54 will nowoperate on a circuit from battery through the windings of relays 53 and54, in series, to ground through the contacts of relays 53 and 59. Theoperation of relay 514 will place ground on the winding of relay 59causing it to operate on a circuit traced from ground on the makecontact of relays 54 through the winding of relay 59 to battery on thebreak contact of relay 59. Relay 59 will now lock up on ground throughits right make Contact. The operation of relay 59 will remove groundfrom the windings of counting relays 5I, 52, 53 and 54 which willrelease, the operation of relay 59 will also cause the operation ofrelays lill and 5I on a circuit traced from battery on the left makecontact of reay 59 to ground through the windings of relays 59 and 6I inseries. The operation of relay 5I will disconnect sending and receivingprinter 62 from the circuit and connect the armature of relay 46 to theupper winding of master relay 53. Master relay 63 operates to actuateindividual sending relays El, 55 and 58 in the same manner as heretoforedescribed in connection with master relay I2 of Fig. 2. The operation ofrelay GII will remove the short-circuiting ground on key 51 from thecontact of relay 65 and will permit relay 58 to follow the operations ofsending relay 55. The operation of the polar repeater set D" from thesending relay is similar to that herein described in connection with theoperation of polar repeater D of Fig. 2. Incidentally, it will be notedthat the operation of relay 6| placed a ground on lamp indicator 19 asan indication to the operator at the division station that generalheadquarters has taken control of the station for broadcasting.

Broadcasting from the central switchboard may now take place.

Receiving set 43 at the division switchboard will record the messagesreceived from the central board. Relay 46 will follow all signals, inturn, operating relay 49 and master relay 63. Relay 63 willautomatically retransmit all incoming signals to the sending relays 64,E5 and 66. Relay 50 is designed to be slow in releasing and will notfollow the message signals actuating relay 49. Relay 54 will operate inresponse to the operation of relay S3 and will open and close a circuittraced from battery 45 through the winding of relay 12, contact of relay64, telegraph channel IS, receiving printer 26 to ground I4. Receivingset 25 will respond to these signals. ln this manner the central boardwill receive the retransmitted message from the division stations whiiebroadcasting to the latter.

Relay 12 will light lamp 1I, in accordance with 111e signalsretransmitted by sending relay G4, in a manner hereinbefore described inconnection with relay 29 and lamp 22 in Fig. 2.

It will be apparent that there may be many more sending relays in serieswith relays 65 and G6 and, also, more line relays in series, with linerelay 6U, if the number of receiving stations desired warrant theaddition.

It is to be noted that the central switchboard may seize control of thecircuit at any time and disconnect sending and receiving printer 62 fromthe master relay E3. Also, for broadcasting from the central switchboardto receiving sets local to the division switchboard, key 61, individualto each local branch receiving set, need not be thrown. The operation ofrelay 69 serves the purpose of conditioning the one-way polar repeaterfor transmitting signals to the branch receiving sets.

After broadcasting a message, general headquarters may send a disconnectsignal to restore the circuit to normal by again operating code key 1for one revolution.

The first break signal transmitted, as spring il touches bushing I0,Will release relay 46 to its spacing contact. The release of relay 46Will operate relay 49, in turn, causing the release of relay 50.Counting relay 55 will then operate from a circuit traced from batterythrough the winding of relay 55 to ground through the break contact ofcounting relay 56 and make contacts of relays 59, 5i) and 49. Whenspring H leaves bushing l and again makes contact on key 1, relay 45will operate, in turn, releasing relay 49. The release o-f relay 49 willcause the operation of relay l). Counting relay 56 will now operate andlock up on a circuit from battery through the windings of relays 55 and5E, in series, to ground through make contact ci counting relay 55, andbreak contact and armature of counting relay 52. The next break signaltransmitted as spring Il reaches bushing lili) will release relay 46, inturn operating relay 49 and causing the release of relay 50, in a mannersimilar to that previously described.

Counting relay 51 will now operate from battery through its winding toground over the break contact of counting relay 5B, make contact ofcounting relay 56, make contact of relay 59. break contact of relay 50,make contact and armature of relay 49. When spring Il returns to itsnormal position after leaving insulated bushing |00, relay 46 willoperate, in turn releasing relay 49 and operating relay 50. Countingrelay 58 will now operate and lock up from battery through the windingsof counting relays 51 and 58, in series, to ground through the makecontact of relay 51 and break contact of relay 52. The operation ofcounting relay 58 will open the operating path for relay 59 by removingbattery from the Winding oi relay 59. Relay 59 will therefore release,in turn, releasing relays 60 and 6I. The release of relay 6I willconnect sending and receiving printer B2 to the upper winding of relayE3 thus restoring the circuit to normal. It will be noted that countingrelays 55, 56, 51 and 5B will remain locked up until generalheadquarters broadcasts again. When this occurs, the operation ofcounting relay 52 will remove ground from the locking up circuit andrelays 55, 56, 51 and 58 will fall down.

It is to be noted at this point, that if general headquarters desires tocommunicate with the division headquarters without broadcasting to thebranch receiving stations associated with each division, code selectorkey 1 will not be operated. The operation of printer i3 (Fig. 2) willcause the operation of receiving only set 48 (Fig. 3). The divisionstation may answer by operating printer 62 (Fig. 3) which, in turn, willcause the operation of relays 53, E4 and receiving set 26.

Sending from division switchboard Ii the division station desires totransmit to its own local branch receiving stations, sending printer 62is utilized. Relay 63 will be under the control of printer 62 and willfunction to actuate sending relays 64, 65 and 65 in the same manner asthat described in connection with receiving signals from generalheadquarters.

'Ihe operation of relay 64 will transmit the message back over telegraphchannel I8 by operating receiving printer at the central switchboard.

In order to transmit to the local receiving station 59, key 51 must bemanually operated. The operation of key 61, removes ground on theswinger of the key from the left winding of relay 68 and permits thelatter to follow the operations of 65. The operation of relay 68, inaccordance with the operation of sending relay 65, causes the signals tobe retransmitted to receiving set E9. It is to be understood that thecircuit description for transmitting to receiving set B9 applies as wellto the operation of all other receiving sets connected to the divisionswitchboard.

Although only one sending and receiving printer is shown at the centraland division switchboards, it is understood, of course, that othersending and receiving printers may be provided for use when a printerset becomes disabled.

What is claimed is:

l. A printing telegraph system of the type used for broadcastingmessages from a central station to a plurality of remote stations. saidremote stations in turn rebroadcasting the messages to a plurality ofbranch stations local to each remote station characterized in this, thatthe remote stations are normally not in condition to rebroadcastmessages received by them and that a special circuit arrangement isutilized at the remote stations for conditioning apparatus at saidstations for automatically rebroadcasting,

Said circuit arrangement being responsive to code signals from saidcentral station.

2. A switchboard for transmitting signals to a plurality of stationscomprising a relay, counting relay means responsive to signals from saidrelay and circuit means responsive to the operation of said countingrelay means for conditioning the switchboard for transmitting signals toa plurality of branch stations.

3. A printing telegraph system comprising a switchboard, a plurality oflocal switchboards, a plurality of branch receiving stations for eachswitchboard, a plurality of telegraph lines con'- necting the branchreceiving stations with each switchboard, a telegraph channel individualto each local switchboard for connecting the local switchboard with thecentral switchboard, circuit means at each local switchboard responsiveto a code signal broadcast from the central switchboard forretransmitting message signals simultaneously to the branch stations.

4. A printing telegraph system in accordance with claim 3, characterizedin this, that means are provided at each local switchboard forautomatically transmitting back to the central switchboard over thetelegraph channel individual to each respective local board, the messagesignals received from said central switchboard.

5. A printing telegraph system comprising a central switchboard, a,local switchboard connected to said central switchboard, branchreceiving stations associated with said local board, circuit means atsaid local board, said circuit means being responsive to a code signalfrom said central switchboard for conditioning said local switchboard toretransmit automatically to said branch receiving stations the messagesignals received from said central switchboard.

6. A radial switching system comprising a central switchboard, a localswitchboard, a plurality of outlying branch stations connected to thelocal switchboard, a telegraph channel connecting said central boardwith said local board, a, telegraph printer at said local switchboardfor transmitting messages from the local switchboard to the branchstations connected thereto, circuit means in said local board responsiveto signals from said central board for seizing control of said localswitchboard from said telegraph printer for broadcasting messages fromsaid central switchboard.

7. A printing telegraph system comprisingr a switchboard, anotherswitchboard connected thereto, receiving sets associated with saidsecond switchboard, relay means and circuit means at said second board,said relay means being responsive to signals from said rst board forconditioning said circuit means to retransmit to the receiving sets themessage signals received from said first board.

8. In a printing telegraph system. having a central station, a pluralityof remote stations, branch stations connected to said remote stations,means at said central station for transmitting signals to any or all ofsaid remote Stations, said remote stations being normally not incondition to rebroadcast messages transmitted from said ccntral station,transmitting mechanism at each of the remote stations for transmittingsignals to said branch station, circuit means at each of the remotestations under the control of the operator at the central station fordisconnecting the transmitting mechanism thereat, in combination with avisual indicator controlled by the disconnection of the transmittingmechanism for indicating to the operator thereat that his transmitter isdisconnected.

9. In a printing telegraph system having a. central station, a pluralityof remote stations, branch stations connected to said remote stations,said remote stations being normally not .in condition to rebroadcastmessages transmitted from said central station, transmitting mechanismat each of the remote stations, circuit means at the remote stationsunder the control of the operator at the central station fordisconnecting the transmitting mechanism thereat, in combination with anindicating device at the control station controlled by therebroadcasting of signals from a remote station to indicate that theremote station is rebroadcasting.

10. A telegraph system comprising a iirst signaling station havingsignal transmitting means and a second signaling station having signalresponsive means operable by signals transmitted from the rst station,signal transmitting means, and means operable by said signal responsivemeans for retransmitting to said iirst signaling station the signals asreceived therefrom, the signal transmitting means at the first stationbeing entirely free from control of the second station.

l1. A telegraph signaling station comprising signal responsive means.means operable by said signal responsive means lor rctransmittingreceivcd signals, signal transmitting means operable independently ofsaid retransmitting means, and means for rendering inoperative saidsignal retransmitting means.

l2. A telegraph signaling station comprising signal responsive means.signal transmitting contacts, other contacts operable by said signalresponsive means for retransmitting received signals and switch meansfor disconnecting the circuit of said other contacts.

i3. A telegraph signaling station comprising signal responsive means,signal transmitting means operable by said signal responsive means forretransmittng received signals, other signal transmitting means operableindependently of said signal retransmitting means, and means forrendering inoperative either oi said signal transmitting means.

14. A telegraph signaling station connected to a communication linecomprising signal responsive means. signal transmitting contactsoperable by said signal responsive means for retransmitting signalsreceived tl'iercby. and other transmitting contacts operableindependently of said signal responsive means. and switch means forconnecting either of said transmitting contacts to said line and fordisconnecting said other transmitting contacts from said line.

15. A telegraph station comprising signal responsive means, signalretransmitting means operable by said signal responsive means,additional signal transmitting means operable independently of saidsignal retransmitting means. and switch means controlled by said signalresponsive means for rendering inoperative either of said signaltransmitting means.

DONALD B. PERRY.

